Series Wiring 137 85. Parallel Wiring 138 86. Multiple Wiring 139 87. Dynamo Connection 142 88. Magneto 142 89. Induction Coil 146 90. High Tension Circuit 147 91. High Tension Connections 149 92. Vibratory Coil 152 93. Contact Maker 154 94. Contact Breaker 155 95. Starting Mechanism 160 96. Muffler 164 97. 3-Point Roller-Bearing 165 98. Wrong Bearing 165 99. Improper Alinement 166 100. Correct Raceways 166 101. Cage for Roller Bearing 167 102. Roller Bearing 168 103. Caution Signs 171 104. Wiring for Lighting Circuit 175 105. Ignition Wiring 177 106. Lubricating System 189 INTRODUCTORY The building and development of auto vehicles form one of the most remarkable pages in the history of manufactures. The subject nearest the boy is the motorcycle, which is a direct development of the bicycle. From this to the larger power vehicles is but another step, so that in setting forth the structures involved the aim should be to show how one form of device grew out of the preceding one, and how each structure following in the train, became desirable and necessary. It would be impossible in a limited work of this kind to show the various modifications of all the elements which make up a complete structure. When these vehicles were first brought out, the mechanism was exceedingly simple, being, in reality, nothing more than the hitching up of some form of motive power with running gears. But now all that is changed. The old type steering mechanism was imperfect; the attachment of the wheels to the axles had to be modified; the wheels themselves entirely revolutionized; speed changing and reversing especially adapted for quick and positive work; and even the easy starting of the motor had to be provided for. The entire equipment required a multiplicity of new devices, such as signaling apparatus, lighting systems, safety appliances, means to prevent skidding, wind shields, a reorganization of body and seating arrangement, and a reconstruction of the springs and their attachment to the chassis. The electrical part has made as rapid strides, and in the development the sparking mechanism has approached perfection, and brought into existence a wonderful variety of systems, so that each cycle of improvements has made them more efficient, but simpler to construct, understand and use.